版權聲明:本文為部落客原創文章,轉載請标明出處。 https://blog.csdn.net/chaoyu168/article/details/52036806
DEMO下載下傳位址:
http://download.csdn.net/detail/chaoyu168/9586664效果圖:
源碼:
package com.zihao.radar;
import android.app.Activity;
import android.os.Bundle;
import android.view.Window;
import android.view.WindowManager;
import com.zihao.radar.view.RadarView;
public class MainActivity extends Activity {
private RadarView mRadarView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
// 取消狀态欄
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.activity_main);
mRadarView = (RadarView) findViewById(R.id.radar_view);
mRadarView.setSearching(true);
mRadarView.addPoint();
mRadarView.addPoint();
}
}
package com.zihao.radar.view;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.util.AttributeSet;
import android.view.View;
import com.zihao.radar.R;
/**
* @ClassName:RadarView
* @Description:TODO<雷達掃描視圖>
* @author:zihao
* @date:2015年11月11日 上午12:26:11
* @version:v1.1
*/
@SuppressLint("DrawAllocation")
public class RadarView extends View {
private Context mContext;
private boolean isSearching = false;// 辨別是否處于掃描狀态,預設為不在掃描狀态
private Paint mPaint;// 畫筆
private Bitmap mScanBmp;// 執行掃描運動的圖檔
private int mOffsetArgs = 0;// 掃描運動偏移量參數
private Bitmap mDefaultPointBmp;// 辨別裝置的圓點-預設
private Bitmap mLightPointBmp;// 辨別裝置的圓點-高亮
private int mPointCount = 0;// 圓點總數
private List<String> mPointArray = new ArrayList<String>();// 存放偏移量的map
private Random mRandom = new Random();
private int mWidth, mHeight;// 寬高
int mOutWidth;// 外圓寬度(w/4/5*2=w/10)
int mCx, mCy;// x、y軸中心點
int mOutsideRadius, mInsideRadius;// 外、内圓半徑
public RadarView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
// TODO Auto-generated constructor stub
init(context);
}
public RadarView(Context context, AttributeSet attrs) {
super(context, attrs);
// TODO Auto-generated constructor stub
init(context);
}
public RadarView(Context context) {
super(context);
// TODO Auto-generated constructor stub
init(context);
}
/**
* TODO<提前初始化好需要使用的對象,避免在繪制過程中多次初始化>
*
* @return void
*/
private void init(Context context) {
mPaint = new Paint();
this.mContext = context;
this.mDefaultPointBmp = Bitmap.createBitmap(BitmapFactory
.decodeResource(mContext.getResources(),
R.drawable.radar_default_point_ico));
this.mLightPointBmp = Bitmap.createBitmap(BitmapFactory.decodeResource(
mContext.getResources(), R.drawable.radar_light_point_ico));
}
/**
* 測量視圖及其内容,以确定所測量的寬度和高度(測量擷取控件尺寸).
*/
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
// TODO Auto-generated method stub
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
// 擷取控件區域寬高
if (mWidth == 0 || mHeight == 0) {
final int minimumWidth = getSuggestedMinimumWidth();
final int minimumHeight = getSuggestedMinimumHeight();
mWidth = resolveMeasured(widthMeasureSpec, minimumWidth);
mHeight = resolveMeasured(heightMeasureSpec, minimumHeight);
mScanBmp = Bitmap.createScaledBitmap(BitmapFactory.decodeResource(
mContext.getResources(), R.drawable.radar_scan_img), mWidth
- mOutWidth, mWidth - mOutWidth, false);
// 擷取x/y軸中心點
mCx = mWidth / 2;
mCy = mHeight / 2;
// 擷取外圓寬度
mOutWidth = mWidth / 10;
// 計算内、外半徑
mOutsideRadius = mWidth / 2;// 外圓的半徑
mInsideRadius = (mWidth - mOutWidth) / 4 / 2;// 内圓的半徑,除最外層,其它圓的半徑=層數*insideRadius
}
}
/**
* 繪制視圖--從外部向内部繪制
*/
@Override
protected void onDraw(Canvas canvas) {
// TODO Auto-generated method stub
super.onDraw(canvas);
// 開始繪制最外層的圓
mPaint.setAntiAlias(true);// 設定抗鋸齒
mPaint.setStyle(Style.FILL);// 設定填充樣式
mPaint.setColor(0xffB8DCFC);// 設定畫筆顔色
// 1.開始繪制圓形
canvas.drawCircle(mCx, mCy, mOutsideRadius, mPaint);
// 開始繪制内4圓
mPaint.setColor(0xff3278B4);
canvas.drawCircle(mCx, mCy, mInsideRadius * 4, mPaint);
// 開始繪制内3圓
mPaint.setStyle(Style.STROKE);
mPaint.setColor(0xff31C9F2);
canvas.drawCircle(mCx, mCy, mInsideRadius * 3, mPaint);
// 開始繪制内2圓
canvas.drawCircle(mCx, mCy, mInsideRadius * 2, mPaint);
// 開始繪制内1圓
canvas.drawCircle(mCx, mCy, mInsideRadius * 1, mPaint);
// 2.開始繪制對角線
canvas.drawLine(mOutWidth / 2, mCy, mWidth - mOutWidth / 2, mCy, mPaint);// 繪制0°~180°對角線
canvas.drawLine(mCx, mHeight - mOutWidth / 2, mCx, mOutWidth / 2,
mPaint);// 繪制90°~270°對角線
// 根據角度繪制對角線
int startX, startY, endX, endY;
double radian;
// 繪制45°~225°對角線
// 計算開始位置x/y坐标點
radian = Math.toRadians((double) 45);// 将角度轉換為弧度
startX = (int) (mCx + mInsideRadius * 4 * Math.cos(radian));// 通過圓心坐标、半徑和目前角度計算目前圓周的某點橫坐标
startY = (int) (mCy + mInsideRadius * 4 * Math.sin(radian));// 通過圓心坐标、半徑和目前角度計算目前圓周的某點縱坐标
// 計算結束位置x/y坐标點
radian = Math.toRadians((double) 45 + 180);
endX = (int) (mCx + mInsideRadius * 4 * Math.cos(radian));
endY = (int) (mCy + mInsideRadius * 4 * Math.sin(radian));
canvas.drawLine(startX, startY, endX, endY, mPaint);
// 繪制135°~315°對角線
// 計算開始位置x/y坐标點
radian = Math.toRadians((double) 135);
startX = (int) (mCx + mInsideRadius * 4 * Math.cos(radian));
startY = (int) (mCy + mInsideRadius * 4 * Math.sin(radian));
// 計算結束位置x/y坐标點
radian = Math.toRadians((double) 135 + 180);
endX = (int) (mCx + mInsideRadius * 4 * Math.cos(radian));
endY = (int) (mCy + mInsideRadius * 4 * Math.sin(radian));
canvas.drawLine(startX, startY, endX, endY, mPaint);
// 3.繪制掃描扇形圖
canvas.save();// 用來儲存Canvas的狀态.save之後,可以調用Canvas的平移、放縮、旋轉、錯切、裁剪等操作.
if (isSearching) {// 判斷是否處于掃描
canvas.rotate(mOffsetArgs, mCx, mCy);// 繪制旋轉角度,參數一:角度;參數二:x中心;參數三:y中心.
canvas.drawBitmap(mScanBmp, mCx - mScanBmp.getWidth() / 2, mCy
- mScanBmp.getHeight() / 2, null);// 繪制Bitmap掃描圖檔效果
mOffsetArgs += 3;
} else {
canvas.drawBitmap(mScanBmp, mCx - mScanBmp.getWidth() / 2, mCy
- mScanBmp.getHeight() / 2, null);
}
// 4.開始繪制動态點
canvas.restore();// 用來恢複Canvas之前儲存的狀态.防止save後對Canvas執行的操作對後續的繪制有影響.
if (mPointCount > 0) {// 當圓點總數>0時,進入下一層判斷
if (mPointCount > mPointArray.size()) {// 當圓點總數大于存儲坐标點數目時,說明有增加,需要重新生成随機坐标點
int mx = mInsideRadius + mRandom.nextInt(mInsideRadius * 6);
int my = mInsideRadius + mRandom.nextInt(mInsideRadius * 6);
mPointArray.add(mx + "/" + my);
}
// 開始繪制坐标點
for (int i = 0; i < mPointArray.size(); i++) {
String[] result = mPointArray.get(i).split("/");
// 開始繪制動态點
if (i < mPointArray.size() - 1)
canvas.drawBitmap(mDefaultPointBmp,
Integer.parseInt(result[0]),
Integer.parseInt(result[1]), null);
else
canvas.drawBitmap(mLightPointBmp,
Integer.parseInt(result[0]),
Integer.parseInt(result[1]), null);
}
}
if (isSearching)
this.invalidate();
}
/**
* TODO<設定掃描狀态>
*
* @return void
*/
public void setSearching(boolean status) {
this.isSearching = status;
this.invalidate();
}
/**
* TODO<新增動态點>
*
* @return void
*/
public void addPoint() {
mPointCount++;
this.invalidate();
}
/**
* TODO<解析擷取控件寬高>
*
* @return int
*/
private int resolveMeasured(int measureSpec, int desired) {
int result = 0;
int specSize = MeasureSpec.getSize(measureSpec);
switch (MeasureSpec.getMode(measureSpec)) {
case MeasureSpec.UNSPECIFIED:
result = desired;
break;
case MeasureSpec.AT_MOST:
result = Math.min(specSize, desired);
break;
case MeasureSpec.EXACTLY:
default:
result = specSize;
}
return result;
}
}
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/bgp"
tools:context="com.zihao.radar.MainActivity" >
<com.zihao.radar.view.RadarView
android:id="@+id/radar_view"
android:layout_width="600px"
android:layout_height="600px"
android:layout_centerInParent="true" />
</RelativeLayout>